Method and apparatus for decoding downlink control signal in wireless cellular communication system

Abstract

The present disclosure relates to a communication technique for converging an IoT technology with a 5G communication system for supporting a higher data transmission rate beyond a 4G system, and a system therefor. The present disclosure may be applied to an intelligent service (for example, a smart home, a smart building, a smart city, a smart car or connected car, healthcare, digital education, retail business, a security and safety related service, or the like) on the basis of a 5G communication technology and an IoT related technology. The present invention relates to a wireless communication system and, specifically, to a method and apparatus for decoding a downlink control signal.

What is claimed is: 
     
       1. A method performed by a terminal in a wireless communication system, the method comprising:
 identifying a plurality of search spaces for the terminal including a common search space (CSS) and a user equipment specific search space (USS); 
 identifying that control channel elements (CCEs) associated with the CSS and CCEs associated with the USS are same; 
 decoding only a downlink control information (DCI) format associated with the CSS, in case that the DCI format associated with the CSS and a DCI format associated with the USS are same and the CCEs associated with the CSS and the CCEs associated with the USS are same; and 
 transmitting, to a base station, a physical uplink shared channel (PUSCH) based on the decoded DCI format associated with the CSS. 
 
     
     
       2. The method of  claim 1 , wherein the USS is not monitored, in case that the CCEs associated with the CSS and the CCEs associated with the USS are same. 
     
     
       3. The method of  claim 1 , further comprising receiving, from the base station, information indicating that an advanced processing time is configured for the terminal,
 wherein the PUSCH is transmitted to the base station in a transmission timing identified based on the advanced processing time, and 
 wherein a processing time according to the advanced processing time is shorter than a processing time without the advanced processing time. 
 
     
     
       4. The method of  claim 1 , wherein the DCI format associated with the CSS and the DCI format associated with the USS are for scheduling the PUSCH. 
     
     
       5. A method performed by a base station in a wireless communication system, the method comprising:
 identifying a plurality of search spaces configured for a terminal including a common search space (CSS) and a user equipment specific search space (USS); and 
 identifying that control channel elements (CCEs) associated with the CSS and CCEs associated with the USS are same; 
 transmitting, to the terminal, downlink control information (DCI) on a physical downlink control channel (PDCCH) in the same CCEs of the CSS and the USS; and 
 receiving, from the terminal, a physical uplink share channel (PUSCH) based on the DCI, 
 wherein in case that a format of the DCI is both a DCI format associated with the CSS and a DCI format associated with the USS and the CCEs associated with the CSS and the CCEs associated with the USS are same, only the DCI format associated with the CSS is decoded. 
 
     
     
       6. The method of  claim 5 , wherein the DCI is not transmitted on the USS, in case that the CCEs associated with the CSS and the CCEs associated with the USS are same. 
     
     
       7. The method of  claim 5 , further comprising transmitting, to the terminal, information indicating that an advanced processing time is configured for the terminal,
 wherein the PUSCH is received from the terminal in a transmission timing identified based on the advanced processing time, and 
 wherein a processing time according to the advanced processing time is shorter than a processing time without the advanced processing time. 
 
     
     
       8. The method of  claim 5 , wherein the DCI format associated with the CSS and the DCI format associated with the USS are for scheduling the PUSCH. 
     
     
       9. A terminal in a wireless communication system, the terminal comprising:
 a transceiver configured to transmit or receive a signal; and 
 at least one processor configured to:
 identify a plurality of search spaces for the terminal including a common search space (CSS) and a user equipment specific search space (USS), 
 identify that control channel elements (CCEs) associated with the first CSS and CCEs associated with the USS are same, 
 decode only a downlink control information (DCI) format associated with the CSS, in case that the DCI format associated with the CSS and a DCI format associated with the USS are same and the CCEs associated with the CSS and the CCEs associated with the USS are same, and 
 transmit, to a base station, a physical uplink shared channel (PUSCH) based on the decoded DCI format associated with the CSS. 
 
 
     
     
       10. The terminal of  claim 9 , wherein the USS is not monitored, in case that the CCEs associated with the CSS and the CCEs associated with the USS are same. 
     
     
       11. The terminal of  claim 9 , wherein the at least one processor is further configured to receive, from the base station, information indicating that an advanced processing time is configured for the terminal,
 wherein the PUSCH is transmitted to the base station in a transmission timing identified based on the advanced processing time, and 
 wherein a processing time according to the advanced processing time is shorter than a processing time without the advanced processing time. 
 
     
     
       12. A base station in a wireless communication system, the base station comprising:
 a transceiver configured to transmit or receive a signal; and 
 at least one processor configured to:
 identify a plurality of search spaces configured for a terminal including a common search space (CSS) and a user equipment specific search space (USS), 
 identify that control channel elements (CCEs) associated with the CSS and CCEs associated with the USS are same, 
 transmit, to the terminal, downlink control information (DCI) on a physical downlink control channel (PDCCH) in the same CCEs of the CSS and the USS, and 
 receive, from the terminal, a physical uplink share channel (PUSCH) based on the DCI, 
 wherein in case that a format of the DCI is both a DCI format associated with the CSS and a DCI format associated with the USS and the CCEs associated with the CSS and the CCE associated with the USS are same, only the DCI format associated with the CSS is decoded. 
 
 
     
     
       13. The base station of  claim 12 , wherein the DCI is not transmitted on the USS, in case that the CCEs associated with the CSS and the CCEs associated with the USS are same. 
     
     
       14. The base station of  claim 12 , wherein the at least one processor is further configured to transmit, to the terminal, information indicating that an advanced processing time is configured for the terminal,
 wherein the PUSCH is received from the terminal in a transmission timing identified based on the advanced processing time, and 
 wherein a processing time according to the advanced processing time is shorter than a processing time without the advanced processing time.